Vibration measurements on wind-screen wipers by tracking laser Doppler vibrometer

A Tracking Laser Doppler Vibrometer (TLDV) measurement system has been developed for measuring vibration of point on an arbitrarily moving objects using Laser Doppler Vibrometer (LDV) with tracking feature. Two tracking strategies were developed in order to measure in-plane and out-of-plane vibration of screen wiper arm. The systems are based on an open loop control system working with information provided by a digital encoder or, alternatively, by wire potentiometer(s) used to determine the position of the object tracked. Examples of vibration measurements on two different type of windscreen wipers are included.